package com.fingard.text;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
 * 加密方法类
 * @author fujia
 *
 */
public class DESHelper {
private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish
	/**
	 * keybyte为加密密钥，长度为24字节
	 * @param ssrc为被加密的数据缓冲区（源）
	 * @return
	 */
    public static byte[] encryptMode(byte[] keybyte, byte[] src) {
       try {
            //生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            //加密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);
         //   new BASE64Encoder().encode(endata);   
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * keybyte为加密密钥，长度为24字节
     * @param src为加密后的缓冲区
     * @return
     */
    public static byte[] decryptMode(byte[] keybyte, byte[] src) {      
	try {
            //生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            //解密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * 转换成十六进制字符串
     * @param b
     * @return
     */
    public static String byte2hex(byte[] b) {
        String hs="";
        String stmp="";
        for (int n=0;n<b.length;n++) {
            stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length()==1) hs=hs+"0"+stmp;
            else hs=hs+stmp;
            if (n<b.length-1)  hs=hs+":";
        }
        return hs.toUpperCase();
    }
    
    /**
     * 测试类方法
     * @param args
     */
    /*
    public static void main(String[] args)
    {

        String szSrc = "100.0";
        System.out.println("加密前的字符串:" + szSrc);
       // new String(DES.encryptMode("111111111111111111111111".getBytes(), "100.0".getBytes()))
        byte[] encoded = encryptMode("111111111111111111111111".getBytes(), szSrc.getBytes());        
        System.out.println("加密后的字符串:" + new String(encoded));
        
        byte[] srcBytes = decryptMode("111111111111111111111111".getBytes(), encoded);
        System.out.println("解密后的字符串:" + (new String(srcBytes)));
    }
*/
}
